Despite recent rumors that Netflix was working towards offering HTML5 support on their Watch Instantly video playback titles, it looks like that will not be happening. In short, as of now it looks like there are no current plans for HTML5 support with Netflix, not to mention, according to Adrian Cockcroft;

“the basic HTML5 Video doesn’t have a viable DRM solution at this point.”

And given that last statement I think just about anyone can understand why Netflix is not considering HTML5 (at least yet).